An efficient, regioselective gold-catalyzed 1,3-transposition reaction of ynones and diynones has been developed. It was found that stereoelectronic (interrupted conjugation) and electronic (extended conjugation) factors could efficiently govern the regioselectivity of this thermodynamically controlled transformation. The produced conjugated diynones were efficiently transformed into diverse alkyne-substituted five- and six-membered heterocycles.
Light-enabled, AlCl<sub>3</sub>-catalyzed regioselective intramolecular nucleophilic addition of non-nucleophilic alkyls to alkynes
作者:Yanbin Zhang、Ruiwen Jin、Guangxing Pan、Hao Guo
DOI:10.1039/d0cc04636a
日期:——
regioselective intramolecularnucleophilic cyclization of alkynes using non-nucleophilic alkyls as the nucleophile is reported. Upon photoexcitation, o-alkylphenyl alkynyl ketones can be transferred into (E)-photoenols. Thus, a nucleophilic methylene is formed from the non-nucleophilic alkyl. An AlCl3 catalyst can stabilize the (E)-photoenol intermediate and facilitate further intramolecularnucleophilic cyclization